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Table 6 Concentrations of trace metals in River and reservoir sediment and its comparison with ERL-ERM ranges of SQGs (mg/kg, dry wt)

From: Distribution and ecological risk assessment of trace metals in surface sediments from Akaki River catchment and Aba Samuel reservoir, Central Ethiopia

Element ERL-ERM range This study range Percentage of sampling sites
< ERL-ERM range Between ERL-ERM range > ERL-ERM range
Dry season
 Cd 1.2–9.6 2.1–2.9 100
 Cr 81–370 16.2–43.7 100
 Cu 34–270 1.6–15.3 100
 Pb 46.7–218 124.4–256.4 91 9
 Ni 20.9–51.6 15.6–36.2 36 64
 Zn 150–410 4.0–110.0 100
Rainy season
 Cd 1.2–9.6 2.5–3.1 100
 Cr 81–370 18.3–29.4 100
 Cu 34–270 2.1–6.2 100
 Pb 46.7–218 101.4–133.7 100
 Ni 20.9–51.6 14.6–24.0 55 45
 Zn 150–410 4.8–38.2 100